@article{young2013pomdp,
  title={Pomdp-based statistical spoken dialog systems: A review},
  author={Young, Steve and Ga{\v{s}}i{\'c}, Milica and Thomson, Blaise and Williams, Jason D},
  journal={Proceedings of the IEEE},
  volume={101},
  number={5},
  pages={1160--1179},
  year={2013},
  publisher={IEEE}
}